class BaseFormat
{
    createDescription(descrptionConfig)
    {
        return descrptionConfig;
    }

    createPopupWindow(popupConfig)
    {
        return popupConfig;
    }
}

class PageFormatFactory
{
    static createBaseFormat()
    {
        return new BaseFormat();
    }

    static createPoemFormat_1()
    {
        return new PoemFormat_1();
    }
}